PRI – The connection between mobile tower and radio tower
PRL – List of Radio frequencies
Baseband – The chip that controls the radio frequency waves within the device.
Explanation:
PRI :
• Stands for Primary rate interface.
• Consists of information pertaining to ID number, network code, country code, etc, to enable the user to connect to the right network
• Gets updated from time to time.
PRL:
• Stands for Preferred Roaming List :
• Contains list of radio frequencies from various geographic location
• Used in CDMA network
• Contains information pertaining to service provider id, radio bands, sub bands, etc.
Baseband:
• Controls GSM and 3G Phone RF waves